Mapeamento geológico de uma porção inserido no distrito pegmatítico Solonópole-Quixeramobim a noroeste do município de Solonópole-CE

Abstract

The study area of this report is located on the north of the Quixeramobim-Solonópole Pegmatitic District (DPSQ), in Solonópole, Ceará, Brazil, which is inserted into the Central Ceará Domain (DCC) of the Borborema Province (PB), more precisely in Ceará Pegmatitic Subprovince. The lithostratigraphic units comprising the mapped portion correspond to:i. Gneissic-migmatitic basement represented by the Acopiara Complex; ii. Neoproterozoic granites; iii. Pegmatites (Phanerozoic) and;iv. Colluvial-alluvial covers. The basement of the mapped area which is composed of metatexites and diatexites, predominates in occurrence and has a preferred orientation NE-SW. The granitesare recognized as plutons intruded into the basement, varying mineralogicaly between syenogranites, granodiorites and monzogranites. Such lithologies sometimes exhibit micaceous minerals (biotite and muscovites) orientated in NE-SW alignment. The pegmatites are found in lenticular form and discordant intrusions compared to the host rocks (migmatites and granites), preferentially oriented along E-W direction, which are heterogeneous type, composed mainly of quartz, plagioclase, K-feldspar and muscovite, and often present mineralization of tourmaline, beryl, amblygonite, apatite, lepidolite, columbite-tantalite (Coltan) and spodumene. Detailed studies of two bodies ("Zé Pelone Mine" and "Cristal Mine") revealed potential for economic exploitation of feldspar and muscovite, both for industrial application. The colluvial-alluvial covers are originated due to weathering processes that affected the basement and granitic bodies.